\( \mathrm{m}=900 \mathrm{gm}=\frac{900}{1000} \mathrm{~kg}=\frac{9}{10} \mathrm{~kg} \)

\( \mathrm{r}=1 \mathrm{~m} \)

\( \omega=\frac{2 \pi \mathrm{N}}{60}=\frac{2 \pi(10)}{60}=\frac{\pi}{3} \mathrm{rad} / \mathrm{sec} \)

\( \mathrm{T}-\mathrm{mg}=\mathrm{mr} \omega^2 \)

\( \mathrm{~T}=\mathrm{mg}+\mathrm{mr} \omega^2 \)

\( =\frac{9}{10} \times 9.8+\frac{9}{10} \times 1\left(\frac{\pi}{3}\right)^2 \)

\( =8.82+\frac{9}{10} \times \frac{\pi^2}{9} \)

\( =8.82+0.98 \)

\( =9.80 \mathrm{~N}\)